COAXIAL CABLE AND MULTICORE COAXIAL CABLE

摘要

Provided are a coaxial cable and a multicore coaxial cable capable of obtaining a low dielectric constant and sufficient strength by ensuring the ratio of a void portion to an insulator. In a coaxial cable (11) in which a central conductor (12) is covered with an insulator (13) comprising a void portion (14) that is continuous in the longitudinal direction and an outer conductor (15) is disposed around the outer periphery of the insulator (13), the void portion (14) has a circular or elliptical cross-sectional shape, and six to nine of the void portions (14) are evenly disposed in the insulator (13).  When the ratio of the void portion to the sum of the area of all the void portions (14) and the area of the insulator (13) in a cross section perpendicular to the length direction of the coaxial cable is defined as the void ratio, the void ratio of the total of all the void portions is 43% or more.  A multicore coaxial cable configured by housing a plurality of coaxial cables (11) may be used.